JP2018531350A6 - Internal gear having internal teeth and crown teeth, method for manufacturing the internal gear, and shift type transmission including the internal gear - Google Patents

Abstract

The present invention relates to an internal gear for a planetary gear type transmission. The internal gear comprises a toothed crown (110). The toothed crown (110) includes an inner tooth (120) on its inner peripheral surface, and a flange (130) protruding radially on its outer peripheral surface and axially protruding on one side. Has been. The flange (130) constitutes a band (131) running in the circumferential direction and a collar-like protrusion (132). The collar-like protrusion (132) includes a crown tooth (140). The crown tooth (140) is configured continuously and also penetrates the band (131) in the axial direction. The invention further relates to a method for producing such an internal gear by producing a crown tooth (140) by means of a cylindrical broach and to a shift transmission comprising at least one such internal gear.
[Selection] Figure 2

Description

  The present invention relates to an internal gear for a planetary gear type transmission having internal teeth and crown teeth. The invention further relates to a method for manufacturing such an internal gear and to a shift transmission comprising at least one such internal gear.

  German patent application 199 61 988 discloses a torque transmission device between an internal gear and an interlocking part. In the internal gear, crown teeth are arranged on the interlocking component side. The teeth of the interlocking parts are inserted into the crown teeth in the axial direction. (See FIG. 2). Furthermore, a further torque transmission device is disclosed. In this case, crown teeth are arranged on the interlocking parts. A crown tooth existing on a flange projecting radially from the internal gear is engaged with the crown tooth. (See Figure 3)

  With respect to the prior art, further, the plug-in connection between the internal gear and the internal gear carrier, as shown in German Offenlegungsschrift 102 30 861, in particular in FIGS. 1, 6, 7, 8 and 10, is shown. Reference is made to the embodiments. In these embodiments, in common, the internal gear includes a flange that protrudes in the radial direction and runs in the circumferential direction on the outer peripheral surface thereof. This flange protrudes in the axial direction on the end side of the internal gear. The axial protrusion is configured with a crown tooth.

German Patent Application Publication No. 199 61 988 German Patent Application No. 102 30 861

  The object of the present invention is to provide an improved internal gear of this kind which has at least one disadvantage associated with the prior art, only without or at least reduced.

  This object is solved by an internal gear according to the invention having the features of claim 1. The parallel claims extend the invention to a method according to the invention for producing an internal gear according to the invention and a shift transmission for a motor vehicle or commercial vehicle. The shift transmission is in particular an automatic transmission and comprises at least one internal gear according to the invention or an internal gear produced according to the invention. Preferred developments and embodiments of the invention will be apparent from the dependent claims, the following description and the drawings for all objects of the invention.

  An internal gear (planetary gear type transmission internal gear) according to the present invention includes a toothed crown. The toothed crown is configured with inner teeth on its inner peripheral surface, and projects radially on the outer peripheral surface and axially on one side (ie, the end of the internal gear or toothed crown). A protruding flange is provided. By this flange, a band running in the circumferential direction and a collar-like protrusion are formed. In addition, the collar-like protrusion has crown teeth. According to the invention, the crown is configured continuously and also penetrates the band axially. That is, the crown tooth is not formed only at the collar-shaped protrusion, but the crown tooth extends in the band so that the crown tooth is continuously formed and penetrates the flange in the axial direction.

  A toothed crown is in particular understood as a ring-shaped body part which is preferably constructed rigidly. The toothed crown includes an inner peripheral surface, an outer peripheral surface, and two end surfaces or end portions. The end surface or the end portion side connects the inner peripheral surface and the outer peripheral surface to each other in a substantially radial extension. The inner teeth formed on the inner peripheral surface are running teeth provided for direct engagement of the planetary gear. A crown tooth is an insertion tooth provided for non-rotatably coupling with an internal gear carrier or the like. The internal gear or its toothed crown has a symmetry axis or a rotation axis. An axial direction and a radial direction perpendicular to the axial direction can be defined by the symmetry axis or the rotation axis.

  In the internal gear according to the present invention, the crown tooth is not formed only at the flange portion protruding beyond the end side, but extends in the axial direction or extends through the entire flange in the axial direction. This provides a number of advantages. On the one hand, significant weight savings or reduced rotational mass can be achieved without changing the structural dimensions. On the other hand, new design possibilities arise for the crown. Thereby, a higher load capacity, easier installation and / or simplified production can be achieved.

  Preferably, the tooth gap of the crown is configured to have a constant or constant gap width in the axial direction. That is, tooth gaps or grooves (see below) formed between adjacent tooth surfaces or groove surfaces (see below) and their associated tooth surfaces (i.e., tooth surfaces facing each other of adjacent teeth). The opening angle during) does not change over the axial progression of the crown.

  Strictly speaking, the teeth that penetrate the flange are plug teeth. The crown tooth in the conventional sense exists only in the tooth portion formed in the axial protrusion of the flange. Preferably, only in this tooth portion, the interdental or crown tooth gap is configured continuously in the radial direction. Thus, these tooth gaps can be engaged from the meshing teeth in the internal gear carrier in a known manner.

  The tooth portion of the crown or plug tooth, which is configured in the band of the flange, preferably comprises a groove tooth space. Each groove-like tooth gap is configured with a groove base and is therefore not continuous in the radial direction. Preferably, each tooth gap formed in the groove in the band comprises two groove surfaces spaced apart from each other in the circumferential direction, and in particular one groove base curved in the circumferential direction. Preferably the groove surface is configured substantially linearly or flatly and can have an inclination angle between 0 ° and 25 ° with respect to the radial direction. Preferably, all tooth gaps or all grooves of the crown tooth are configured identically. Also, for example, non-identical shapes are possible that allow the attachment position to be presented in advance.

  In the tooth gap of the groove, a free-stroke transition can be formed between the groove surface and the groove base. The free-stroke transition is preferably configured over the entire length of the groove in the axial direction. This free stroke transition can reduce the stress peak induced by the notch effect. Furthermore, the meshing teeth of the connected internal gear carriers can be configured with sharper edges. This has an advantageous effect on both the manufacturing effort and manufacturing cost of the internal gear carrier and the effort for installation. The free-stroke transition is preferably made or made together during the manufacture of the crown by machining. The free-stroke transition also serves as a walk-through zone for the tool and / or allows removal of the tip during manufacture. Therefore, in particular, manufacturing methods that have not been used in the past can also be used to create crown teeth.

  The internal gear according to the invention is preferably produced in one piece, i.e. from one workpiece. Preferably, the internal gear is made of a metal material, in particular a steel material. Preferably, at least the crown or insertion tooth is produced by machining.

In accordance with the foregoing description, the preferred method for manufacturing the internal gear according to the invention particularly comprises at least the following steps which are carried out automatically:
-Preparing a ring-shaped blank already configured with a flange;
-The step of producing internal teeth with an internal broach, optionally a torsion broach or the like;
Producing a crown or insertion tooth on the flange by means of a cylindrical broach.

  A manufacturing method comprising the steps described above is the subject of the first parallel claim. The internal teeth and crown teeth can also be made in the reverse order. The flange portion protruding in the collar shape can be manufactured before the insertion teeth are manufactured, in particular by blank preparation and / or machining preparation (during prefabrication), or even after the insertion teeth are manufactured, For example, it can be manufactured by perforation. (In that case, the tooth gaps of the already inserted teeth or crowns are manufactured continuously in the radial direction.)

  The blank is, for example, a solid forged part or a turning part that has been manufactured in a preceding manufacturing process. The internal or running teeth are manufactured in a conventional manner according to the method. A crown tooth or an insertion tooth is manufactured by a cylindrical broach (pot broaching) according to a method. The crown teeth in this type of internal gear have been produced so far by milling or the like, and in particular by so-called impact rotation. Therefore, these methods are innovative. Thus, according to the present invention, an alternative manufacturing method for this type of internal gear is already provided.

  As described above, the crown teeth are continuously formed according to the present invention, and in particular, the continuous tooth gap or the tooth gap passing through the flange in the axial direction is formed in a groove shape, thereby simplifying the production of the crown tooth. Can be realized. Thereby, the manufacture of the internal gear is also simplified. This is achieved with a cylindrical broach according to the method described above.

  In a cylindrical broach, the blank or workpiece is pulled or pressed through a tubular broach tool. As the relative movement progresses, the crown is manufactured on the workpiece continuously through material removal by cutting. Meanwhile, the workpiece is surrounded in all directions by a tubular broaching tool. Typically, a crown is completely fabricated in a single work step or broach passage. Usually, no post-processing is performed. This process can also be referred to as an outer broach. Cylindrical broaching or external broaching takes place on cylindrical broaching machines, in particular on vertical or horizontal cylindrical broaching machines.

  Preferably, the broach tool used to make the crown is provided with a so-called broach edge. The broach edge is specifically equipped for chip discharge. The broach edge is configured in particular so that a free-stroke transition can be produced simultaneously between the groove surface and the groove base.

  The invention is explained in more detail below by way of example and not limitation with reference to the drawings. The features shown in the drawings and / or described below can further develop the present invention, even away from specific feature combinations.

It is sectional drawing of the internal gear carrier fixed to the toothed crown of the planetary gear type transmission internal gear by this invention, and a toothed crown. It is an expanded sectional view of the toothed crown of FIG. FIG. 3 is another cross-sectional view of the toothed crown of FIG. 1 along the cross-sectional line shown in FIG. a), b) is a figure which manufactures a crown tooth on the toothed crown of FIG. 1 with a cylindrical broach.

  FIG. 1 shows a toothed crown 110 of an internal gear 100 according to the invention for a planetary gear type transmission in a view similar to DE 199 61 988. For the sake of easy viewing, the peripheral edge is not shown. The internal gear 100 includes a symmetry axis or a rotation axis L. An axial direction and a radial direction R perpendicular to the axial direction are defined by the symmetry axis or the rotation axis L. An internal gear carrier 200 is fixed to the toothed crown 110. The internal gear carrier 200 plays a role of non-rotatably coupling with a shaft or another gear as an interlocking component at the same time. Similarly, the internal gear carrier 200 can be a holding portion that holds the internal gear 100. The internal gear carrier 200 is a sheet metal part manufactured by punching and forming.

  The toothed crown 110 includes an inner tooth 120 on the inner periphery thereof. The internal teeth 120 mesh with the planetary gear of the planetary gear type transmission. In particular, the toothed crown 110 is involute teeth and / or helical. The toothed crown 110 is provided with a flange 130 on its outer peripheral surface configured to run in the circumferential direction. The protruding flange 130 includes two flange portions 131 and 132 (see FIG. 2). The first flange portion 131 extends over only a part of the width of the toothed crown 110. The first flange portion 131 increases the thickness of the toothed crown 110 in the radial direction, thereby forming a band that runs in the circumferential direction. On the side of the internal gear carrier 200, the second flange portion 132 that protrudes or protrudes in the axial direction beyond the end portion side 115 of the toothed crown 110 constitutes a collar-shaped protrusion. An internal gear carrier 200 is fixed to the collar-like protrusion.

  The flange 130 that runs in the circumferential direction is configured to include crown teeth or insertion teeth 140 over the entire circumference of the toothed crown 110. The internal gear carrier 200 includes corresponding meshing teeth. The internal gear carrier 200 is fastened on or inserted into the crown tooth 140 by the meshing teeth. Thereby, there exists a connection part which cannot be rotated. Axial fixation is performed with the aid of the fixing ring 300. Unlike similar internal gears known from the prior art, the crown 140 configured on the flange 130 is configured continuously and extends through or through the flange 130 in the axial direction L. This has many advantages, as explained above.

  In the second flange portion 132 from which the crown tooth 140 protrudes, the tooth gap 142 is configured continuously in the radial direction R. As is apparent from FIGS. 2 and 3, the tooth gap 142 continues as a tooth gap of a groove having the same gap width w in the band-shaped first flange portion 131. Here, the tooth gap 142 extending between the adjacent teeth 141 includes two tooth surfaces or groove surfaces 143 spaced apart from each other in the circumferential direction U, and one groove base portion 144 curved in the circumferential direction U. . The linear and mutually symmetric groove surfaces 143 can have an inclination angle a between 0 ° and 25 ° with respect to the radial direction R of the toothed crown 110. Between the groove surface 143 and the groove base 144, a free-stroke transition portion 145 extending in the axial direction is formed. The tooth gap or groove 142 passing through the flange 130 is constant in the axial direction L. That is, the outline of the tooth gap or groove 142 does not change over the course of the axial direction. As is apparent from FIG. 2, the groove base 144 runs in the axial direction or runs parallel to the axis of symmetry or the axis of rotation L.

  In FIG. 4, the manufacture of crown tooth 140 is shown. FIG. 4a shows a prefabricated internal gear 100 '. The internal gear 100 ′ is made of a steel material in one piece, and includes a flange 130 and internal teeth 120. As shown in FIG. 4 b), the internal gear 100 ′ that is configured without the crown tooth 140 is pressed against the push rod 20 and passes through the tubular broach tool 10 with the help of the push rod 20. Pressed. (Push-through is performed from left to right according to the figure.) The broach tool 10 comprises a tube 11 with a tool insert 12 inside. The tool insert 12 produces the crown tooth 140 of FIGS. 2 and 3 on the flange 130 of the internal gear 100 ′ through material removal by cutting. In this case, all the teeth 141 and tooth gaps or grooves 142 in the crown tooth 140 are configured in a single work process or broach passage. This process is called a cylindrical broach. The not true scale figure (b in FIG. 4) merely illustrates the principle of the cylindrical broach. )

  Accordingly, the crown 140 manufactured by the method described above is an insertion tooth that has been subjected to a cylindrical broaching process extending in the axial direction. The second flange portion 132 that protrudes in the axial direction in the flange 130 can be manufactured by drilling the end portion side, particularly before or after the cylindrical broach.

DESCRIPTION OF SYMBOLS 10 Broach tool 11 Cylinder 12 Tool insert 20 Push rod 100 Internal gear 110 Toothed crown 115 End side 120 Internal tooth (running tooth)
130 Flange 131 First flange (band)
132 Second flange (protrusion)
140 Crown tooth (insertion tooth)
141 tooth 142 tooth gap, groove 143 tooth surface, groove surface 144 groove base 145 transition part 200 internal gear carrier 300 fixing ring L axial direction (symmetric axis)
R radial direction U circumferential direction a angle w width

Claims (10)

  An internal gear (100) for a planetary gear type transmission, which includes a toothed crown (110), and the toothed crown (110) has an internal tooth (120) on an inner peripheral surface of the toothed crown (110). And a flange (130) projecting radially and projecting axially on one side on the outer peripheral surface of the toothed crown (110), the flange (130) A collar (131) and a collar-like protrusion (132), and the collar-like protrusion (132) is an internal gear (100) provided with a crown (140). An internal gear (100) characterized in that it is constructed continuously and also penetrates the band (131) in the axial direction.   The internal gear (100) according to claim 1, wherein the tooth gap (142) of the crown tooth (140) has a constant gap width (w) in the axial direction (L). An internal gear (100) characterized by that.   3. The internal gear (100) according to claim 1, wherein in the collar-shaped protrusion (132), the tooth gap (142) of the crown tooth (140) is configured continuously in the radial direction. An internal gear (100) characterized in that   The internal gear (100) according to any one of claims 1 to 3, wherein the tooth gap (142) of the crown tooth (140) is configured as a groove in the band (131) and An internal gear (100), each comprising a groove base (144).   5. The internal gear (100) according to claim 4, wherein each of the groove-shaped tooth gaps (142) includes two groove surfaces (143) spaced apart from each other in the circumferential direction (U) and the circumferential direction ( An internal gear (100) comprising: a groove base (144) curved to U).   6. The internal gear (100) according to claim 5, wherein the groove surface (143) is configured in a straight line, and an inclination angle between 0 ° and 25 ° with respect to the radial direction (R). An internal gear (100) comprising (a).   It is an internal gear (100) of Claim 5 or 6, Comprising: The free-stroke-like transition part (145) is comprised between the said groove surface (143) and the said groove base (144). An internal gear (100) characterized by:   The internal gear (100) according to any one of the preceding claims, wherein the internal gear (100) is manufactured in one piece from a metal material. A method for manufacturing an internal gear (100) according to any one of the preceding claims, wherein:
-Providing a ring-shaped blank (100 ') already configured with a flange (130);
-Producing said internal teeth (120) from an internal broach;
Producing the crown (140) on the flange (130) with a cylindrical broach. A shift type transmission for an automobile or commercial vehicle, in particular an automatic transmission, comprising at least one internal gear (100), the internal gear (100) being configured according to any one of claims 1-8. And / or manufactured by the method according to claim 9.

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